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Space Ironmen Kyodain (宇宙鉄人キョーダイン -
Uchuu Tetsujin Kyodain) was a live action (Tokusatsu) Television program that ran from April 1976 to march 1977 lasting 48 episodes. The character design of the show was done by the legendary
Shotaro Ishinomori.

The show chronicled the adventures of Kenji, a young boy whose Father (Dr. Hayami) and two Brothers (Jouji and Ryuji) are kidnapped by the Robot Army Corps. When the Robot Army Corps invade Japan, a UFO carrying two robots arrive to save the day. The two robots are Sky Zero (スカイゼル - sukaizeru or Skyzel) who has Joji's spirit and Ground Zero (グランゼル - guranzeru or Granzel) which has Ryuji's spirit. Each of these robots was created by the kidnapped Dr. Hayami, who programmed them to have the spirit of Kenji's older brothers in them. The robots purpose is to watch over young Kenji and protect the earth from the Robot Army Corps.

Both Skyzel and Granzel can transform into two alternate modes, which can combine into another two vehicles. First, Skyzel and Granzel form flight modes and combine to form the Sky Jet (with Gran Missile). The two can also form the Gran Car (with Sky Missile).

While Kyodain never aired in the states, the Sky Jet and Grand Car made appearances as a part of the Shogun Warriors line of Action Vehicles.